EP0445620B1 - Ressorts à lame en matériau composite fibre/matière plastique - Google Patents

Ressorts à lame en matériau composite fibre/matière plastique Download PDF

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Publication number
EP0445620B1
EP0445620B1 EP91102742A EP91102742A EP0445620B1 EP 0445620 B1 EP0445620 B1 EP 0445620B1 EP 91102742 A EP91102742 A EP 91102742A EP 91102742 A EP91102742 A EP 91102742A EP 0445620 B1 EP0445620 B1 EP 0445620B1
Authority
EP
European Patent Office
Prior art keywords
plastic matrix
leaf springs
layer
forces
plastic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP91102742A
Other languages
German (de)
English (en)
Other versions
EP0445620A2 (fr
EP0445620A3 (en
Inventor
Helmut Schuermann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BASF SE
Original Assignee
BASF SE
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Filing date
Publication date
Application filed by BASF SE filed Critical BASF SE
Publication of EP0445620A2 publication Critical patent/EP0445620A2/fr
Publication of EP0445620A3 publication Critical patent/EP0445620A3/de
Application granted granted Critical
Publication of EP0445620B1 publication Critical patent/EP0445620B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F1/00—Springs
    • F16F1/36—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers
    • F16F1/366—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers made of fibre-reinforced plastics, i.e. characterised by their special construction from such materials
    • F16F1/368—Leaf springs

Definitions

  • Leaf springs are increasingly being made from fiber / plastic composite material, with unidirectional reinforcing fibers aligned in the longitudinal direction being embedded in a plastic matrix.
  • Various stresses occur across a cross-section of a leaf spring under load.
  • the concave side there are tensile stresses, on the opposite, convex side, there are mainly compressive stresses.
  • the leaf spring In the middle of the cross-section, the leaf spring is mainly subjected to shear. Failure, especially with dynamic loading, almost always starts from the matrix or the fiber / matrix interface.
  • the invention was based on the object of increasing the resilience in leaf springs made of a fiber / plastic composite.
  • the invention accordingly relates to leaf springs, consisting of a plastic matrix and reinforcing fibers oriented in the longitudinal direction, with at least two layers running essentially parallel to the surface of the spring, the individual layers each consisting of plastic matrix and reinforcing fibers, in the different layers the plastic matrix consisting of different types, however, plastics are compatible with one another, and the plastic matrix in the layer on the side subjected to compressive forces has a higher modulus of elasticity than the plastic matrix in the layer on the side subject to tensile forces.
  • leaf springs have the advantage that they can be loaded more dynamically compared to conventional springs made of fiber / plastic composite, and that an increased resistance to temperature and moisture influences can be set specifically. In addition, cost savings can be achieved by using less expensive matrix systems in less stressed areas.
  • EP-A 84 101 describes leaf springs made of several similar laminate layers which are connected to one another by adhesive layers. They can also contain damping layers made of rubber-elastic material, but these do not contribute to the resilience of the springs.
  • leaf springs made of fiber / plastic composite are known.
  • the usual glass, carbon or aramid fibers are used as reinforcing fibers.
  • the fiber content is usually between 40 and 65 vol .-%, the thickness of the springs can be wide
  • Boundaries vary between 20 and 100 mm, generally being thicker in the middle than at the front and rear ends.
  • the springs can be straight or curved.
  • Prepregs for the leaf springs are produced by impregnating fiber layers with the plastics in the form of a melt, a solution or powder, and then shaping the prepregs by pressing, with thermosetting resins being cured at the same time.
  • thermoplastics these can also be mixed with the reinforcing fibers in the form of fibers, whereupon the hybrid yarn thus produced is pressed.
  • the leaf springs according to the invention consist of several layers with different types of plastic matrices, preferably of two layers.
  • the plastic matrix in the outer layer should have a relatively high modulus of elasticity (according to DIN EN 61) on the side subjected to compressive forces (in the case of curved springs this is the convex surface).
  • the shear modulus (according to DIN 53 445) of the plastic matrix, measured in the torsional vibration test at 70 ° C and a relative humidity of 95%, should be above 1000 N ⁇ mm ⁇ 2, especially above 1150 N ⁇ mm ⁇ 2.
  • thermosetting resins are preferred as plastics, preferably epoxy resins, vinyl ester resins and bismaleimide resins. This layer preferably makes up 20 to 80% of the total volume of the leaf spring.
  • the plastic matrix in the outer layer on the side of the spring that is subjected to tensile forces should have a relatively high toughness.
  • the same thermosetting resins come into question here, but are preferably modified by rubbers (e.g.
  • thermoplastic additives e.g. polysulfones, polyolefins, polyimides or polyamides.
  • epoxy resins it is also possible to increase the toughness by choosing suitable, for example longer-chain, difunctional ones Increase epoxies or hardener systems.
  • thermoplastics such as polysulfones, polyketones, polycarbonates, polyarylene sulfides or polyamides can also be used here.
  • a resin with high shear strength, good fracture toughness and high energy release rate under shear stress is used here as the plastic matrix.
  • rubber-modified curable resins as are usually used in adhesive formulations, are suitable.
  • the individual layers are joined by first producing prepregs from reinforcing fibers and the various plastic matrices, draping these prepregs, optionally with adhesive films, and then pressing them.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Springs (AREA)
  • Laminated Bodies (AREA)
  • Vibration Prevention Devices (AREA)
  • Reinforced Plastic Materials (AREA)

Claims (5)

  1. Ressort-lame constitué d'une matrice de matière plastique et de fibres de renforcement orientées en direction longitudinale, à au moins deux couches qui s'étendent sensiblement parallèlement à la surface du ressort, caractérisé par le fait que chacune des couches est constituée d'une matrice de matière plastique et de fibres de renforcement, la matrice de matière plastique étant formée dans les différentes couches de matières plastiques différentes mais compatibles les unes avec les autres et que la matrice de matière plastique dans la couche sur le côté soumis aux forces de pression possède un module d'élasticité plus élevé que la matrice de matière plastique dans la couche sur le côté soumis aux forces de traction.
  2. Ressort-lame selon la revendication 1, caractérisé par le fait que la matrice de matière plastique est constituée de duroplastes de préférence de résines époxy, résines bismaléinimides ou résines vinylesters durcies.
  3. Ressort-lame selon la revendication 3, caractérisé par le fait que, dans la couche sur le côté soumis aux forces de traction, la matrice de matière plastique est une matière plastique duroplastique modifiée par du caoutchouc ou un thermoplaste.
  4. Ressort-lame selon la revendication 4, caractérisé par le fait que, dans la couche sur le côté soumis aux forces de pression, la matrice de matière plastique est un duroplaste et, dans la couche sur le côté soumis aux forces de traction, la matrice de matière plastique est un thermoplaste.
  5. Procédé de fabrication du ressort-lame selon la revendication 1, caractérisé par le fait que l'on forme des pré-imprégnés des fibres de renforcement et de la matrice de matière plastique, on applique la pré-imprégné les uns sur les autres, on les presse et on durcit éventuellement la matière plastique.
EP91102742A 1990-03-08 1991-02-25 Ressorts à lame en matériau composite fibre/matière plastique Expired - Lifetime EP0445620B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4007346 1990-03-08
DE4007346A DE4007346A1 (de) 1990-03-08 1990-03-08 Blattfedern aus faser/kunststoff-verbund

Publications (3)

Publication Number Publication Date
EP0445620A2 EP0445620A2 (fr) 1991-09-11
EP0445620A3 EP0445620A3 (en) 1992-10-28
EP0445620B1 true EP0445620B1 (fr) 1995-07-05

Family

ID=6401718

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91102742A Expired - Lifetime EP0445620B1 (fr) 1990-03-08 1991-02-25 Ressorts à lame en matériau composite fibre/matière plastique

Country Status (4)

Country Link
EP (1) EP0445620B1 (fr)
JP (1) JPH04211734A (fr)
AT (1) ATE124761T1 (fr)
DE (2) DE4007346A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996027507A1 (fr) * 1995-03-06 1996-09-12 Esoro Ag Suspension de roues avec amortisseur a ressort transversal a lame
TW494060B (en) * 2000-04-14 2002-07-11 John T S Lin Molding method of carbon fiber layer
JP2005066870A (ja) * 2003-08-26 2005-03-17 Tsuchiya Co Ltd 複合材料
DE102005054334A1 (de) * 2005-11-11 2007-05-24 Ifc Composite Gmbh Blattfeder, bestehend aus einem speziellen Faserverbundwerkstoff
DE102007003596B4 (de) * 2007-01-25 2010-11-25 Ifc Composite Gmbh Verfahren zur Herstellung einer Blattfeder aus einem Faserverbundwerkstoff mit einem thermoplastischen Kunststoff
DE102007031104B4 (de) * 2007-07-04 2016-02-25 Ifc Composite Gmbh Verfahren zur Herstellung einer Blattfeder aus einem Faserverbundwerkstoff mit einem Thermoplast sowie derartig hergestellte Blattfeder
JP5548516B2 (ja) 2010-05-14 2014-07-16 日本発條株式会社 繊維強化プラスチック製ばね
EP4005788A4 (fr) * 2019-07-30 2022-09-14 Mitsubishi Gas Chemical Company, Inc. Procédé de production de produit formé et matériau composite

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3698702A (en) * 1971-03-05 1972-10-17 Lord Corp Composite leaf spring
DE3200877C2 (de) * 1982-01-14 1985-09-05 Messerschmitt-Bölkow-Blohm GmbH, 8000 München Verfahren und Vorrichtung zum Herstellen von Blattfedern aus faserverstärkten Werkstoffen
US4688778A (en) * 1982-10-01 1987-08-25 Isosport Verbundbauteile Ges.M.B.H. Plastic leaf spring
EP0156148B1 (fr) * 1984-03-30 1990-11-22 American Cyanamid Company Composés fibres-résine, résistants à une force d'impact élevée
EP0327142B1 (fr) * 1984-03-30 1996-01-10 Cytec Technology Corp. Composés résine-matrices
DE3613990A1 (de) * 1986-04-25 1987-10-29 Ruetgerswerke Ag Verbundwerkstoffe, verfahren zu ihrer herstellung und verwendung

Also Published As

Publication number Publication date
DE59105895D1 (de) 1995-08-10
EP0445620A2 (fr) 1991-09-11
EP0445620A3 (en) 1992-10-28
DE4007346A1 (de) 1991-09-12
ATE124761T1 (de) 1995-07-15
JPH04211734A (ja) 1992-08-03

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